U.S. patent application number 11/503240 was filed with the patent office on 2007-08-09 for backlight module and liquid crystal display device incorporating the same.
This patent application is currently assigned to AU OPTRONICS CORP.. Invention is credited to Chun-Yen Lin, Ying Szutu.
Application Number | 20070182884 11/503240 |
Document ID | / |
Family ID | 38333686 |
Filed Date | 2007-08-09 |
United States Patent
Application |
20070182884 |
Kind Code |
A1 |
Lin; Chun-Yen ; et
al. |
August 9, 2007 |
Backlight module and liquid crystal display device incorporating
the same
Abstract
A backlight module and a liquid crystal display device
incorporating the same are provided. The backlight module includes
a bezel, a light source and a heat dissipation element. The bezel
has an opening. The light source is disposed on the bezel. The heat
generation portion of the light source corresponds to the opening.
One end of the heat dissipation element is positioned between the
bezel and the light source. The other end of the heat dissipation
element has a protrusion portion which is inserted into the opening
and projected outside the bezel. The lateral surface of the
protrusion portion is abutted against the inner wall of the
opening.
Inventors: |
Lin; Chun-Yen; (Banciao
City, TW) ; Szutu; Ying; (Taichung, TW) |
Correspondence
Address: |
BACON & THOMAS, PLLC
625 SLATERS LANE, FOURTH FLOOR
ALEXANDRIA
VA
22314
US
|
Assignee: |
AU OPTRONICS CORP.
Hsin-Chu
TW
|
Family ID: |
38333686 |
Appl. No.: |
11/503240 |
Filed: |
August 14, 2006 |
Current U.S.
Class: |
349/65 |
Current CPC
Class: |
G02F 1/133628 20210101;
G02F 1/133604 20130101; G02F 1/133608 20130101 |
Class at
Publication: |
349/65 |
International
Class: |
G02F 1/1335 20060101
G02F001/1335 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 9, 2006 |
TW |
95104403 |
Claims
1. A backlight module, comprising: a bezel having at least one
opening; a light source disposed above the bezel, wherein the heat
generation portion of the light source corresponds to the opening;
and a heat dissipation element, wherein one end of the heat
dissipation element is positioned between the bezel and the light
source, the other end of the heat dissipation element has a
protrusion portion which is inserted into the opening and projected
outside the bezel.
2. The backlight module according to claim 1, further comprising: a
reflector disposed between the bezel and the light source.
3. The backlight module according to claim 1, wherein the bezel
further has a bottom plate and a side plate, an accommodation space
is defined by the bottom plate and the side plate, the light source
is disposed in the accommodation space, the bottom plate has the
opening, and the protrusion portion is inserted into the opening
and projected outside the bottom plate.
4. The backlight module according to claim 3, further comprising: a
reflector disposed in the accommodation space and positioned among
the bottom plate, the side plate and the light source.
5. The backlight module according to claim 1, wherein the bezel
further has a bottom plate and a side plate, an accommodation space
is defined by the bottom plate and the side plate, the light source
is disposed in the accommodation space, the bottom plate has a
recess, the recess has the opening, and the protrusion portion is
inserted into the opening and projected outside the bottom of the
recess.
6. The backlight module according to claim 5, further comprising: a
reflector disposed in the accommodation space and positioned among
the bottom plate, the side plate and the light source.
7. The backlight module according to claim 1, wherein the bezel has
the plurality of openings, and the protrusion portion comprises a
plurality of fins correspondingly inserted into the openings and
projected outside the bezel.
8. The backlight module according to claim 1, wherein the
protrusion portion comprises a plurality of fins inserted into the
opening and projected outside the bezel.
9. The backlight module according to claim 1, wherein the heat
dissipation element includes metal or metallic alloy.
10. The backlight module according to claim 1, wherein the bezel
further has a bottom plate and a side plate, an accommodation space
is defined by the bottom plate and the side plate, the light source
is disposed in the accommodation space, the side plate has the
opening, and the protrusion portion is inserted into the opening
and projected outside the side plate.
11. A liquid crystal display device, comprising: a backlight
module, comprising: a bezel having at least one opening; a light
source disposed above the bezel, wherein the heat generation
portion of the light source corresponds to the opening; and a heat
dissipation element, wherein one end of the heat dissipation
element is positioned between the bezel and the light source, the
other end of the heat dissipation element has a protrusion portion,
and the protrusion portion is inserted into the opening and
projected outside the bezel; a first polarizer and a second
polarizer both disposed above the backlight module; and a liquid
crystal display panel disposed between the first polarizer and the
second polarizer.
12. The liquid crystal display device according to claim 11,
wherein the backlight module further comprises: a reflector
disposed between the bezel and the light source.
13. The liquid crystal display device according to claim 11,
wherein the bezel further has a bottom plate and a side plate, an
accommodation space is defined by the bottom plate and the side
plate, the light source is disposed in the accommodation space, the
bottom plate has the opening, and the protrusion portion is
inserted into the opening and projected outside the bottom
plate.
14. The liquid crystal display device according to claim 13,
wherein the backlight module further comprises: a reflector
disposed in the accommodation space and positioned among the bottom
plate, the side plate and the light source.
15. The liquid crystal display device according to claim 11,
wherein the bezel further has a bottom plate and a side plate, an
accommodation space is defined by the bottom plate and the side
plate, the light source is disposed in the accommodation space, the
bottom plate has a recess, the recess has the opening, and the
protrusion portion is inserted into the opening and projected
outside the bottom of the recess.
16. The liquid crystal display device according to claim 15,
wherein the backlight module further comprises: a reflector
disposed in the accommodation space and positioned among the bottom
plate, the side plate and the light source.
17. The liquid crystal display device according to claim 11,
wherein the bezel has the plurality of openings, and the protrusion
portion comprises a plurality of fins correspondingly inserted into
the openings and projected outside the bezel.
18. The liquid crystal display device according to claim 11,
wherein the protrusion portion comprises a plurality of fins
inserted into the opening and projected outside the bezel.
19. The liquid crystal display device according to claim 11,
wherein the heat dissipation element includes metal or metallic
alloy.
20. The liquid crystal display device according to claim 11,
wherein the bezel further has a bottom plate and a side plate, an
accommodation space is defined by the bottom plate and the side
plate, the light source is disposed in the accommodation space, the
side plate has the opening, and the protrusion portion is inserted
into the opening and projected outside the side plate.
Description
[0001] This application claims the benefit of Taiwan Patent
Application Serial No. 95104403, filed Feb. 9, 2006, the subject
matter of which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The invention relates in general to a backlight module and a
liquid crystal display device incorporating the same, and more
particularly to a backlight module, which has a heat dissipation
element passing through and projected outside the bezel, and a
liquid crystal display device incorporating the same.
[0004] 2. Description of the Related Art
[0005] Along with the advance in the manufacturing technology of
liquid crystal display (LCD) device devices and further due to the
features of slimness, lightweight, low energy consumption and no
radiation, LCD devices have been widely applied in various
electronic products such as personal digital assistant (PDA),
notebook computer, digital camera, digital video recorder, mobile
phone, computer monitor, and liquid crystal TV. And further with
large amount of input in research and development and the adoption
of large-scaled production facilities, the quality of LCD devices
continue to increase yet the prices keep falling down.
Consequently, the application of LCD devices grows wider and wider.
However, the LCD panel of an LCD device is a not a self-luminous
display panel, and can not display without being availed by the
light provided by a backlight module.
[0006] Conventional backlight module includes a bezel, a reflector,
a number of lamps, a diffuser and an optical film module. The
reflector is disposed on the bezel. The lamps are arranged above
the reflector. The diffuser is disposed above the cold cathode
fluorescent lamps (CCFLs). The optical film module is disposed
above the diffuser. The optical film module includes a prism, a
diffuser or a brightness enhancement film. When assembled with the
backlight module, the liquid crystal display panel is disposed
above the optical film.
[0007] Since the lamp is a high-temperature thermal source, the
lamp emits both the light and the heat when a starting voltage is
applied to the lamp. Besides, the lamp is enclosed inside the
backlight module, so the heat generated by the lamp is unable to be
dissipated effectively. As a result, the internal temperature of
the backlight module is increased. Furthermore, the lamp generates
better luminance efficiency when the temperature of the work
environment is within a particular range (65.about.75.degree. C.
for example). Therefore, the luminance efficiency of the lamp tends
to deteriorate in a high-temperature work environment. Thus, the
luminance of the backlight module is largely reduced, and the
operation quality of the liquid crystal display device is severely
affected.
[0008] Particularly, when the scale of the liquid crystal display
device and the scale of the backlight module are getting larger and
larger, the lamp needs to be longer and the starting voltage of the
lamp becomes larger and larger. Consequently, while the temperature
inside the backlight module grows higher and higher, the luminance
efficiency of the lamp is deteriorated, and the operation quality
of the liquid crystal display device is decreased.
SUMMARY OF THE INVENTION
[0009] It is therefore an object of the invention to provide a
backlight module and a liquid crystal display device incorporating
the same. The design of enabling the heat dissipation element to
pass through the bezel and be projected outside the bezel
effectively dissipates the heat generated inside the light source
of the backlight module, so that the internal temperature of the
backlight module is decreased. Thus, the luminance efficiency of
the light source is improved, the luminance of the backlight module
is enhanced, and operation quality of the liquid crystal display
device is maintained.
[0010] The invention achieves the above-identified object by
providing a backlight module. The backlight module includes a
bezel, a light source and a heat dissipation element. The bezel has
at least one opening. The light source is disposed on the bezel.
The heat generation portion of the light source corresponds to the
opening. One end of the heat dissipation element is positioned
between the bezel and the light source. The other end of the heat
dissipation element has a protrusion portion, which is inserted
into the opening and projected outside the bezel.
[0011] The invention achieves the above-identified object by
providing a liquid crystal display device. The liquid crystal
display device includes a backlight module, a first polarizer, a
second polarizer and a liquid crystal display panel. The backlight
module includes a bezel, a light source and a heat dissipation
element. The bezel has at least one opening. The light source is
disposed on the bezel. The heat generation portion of the light
source corresponds to the opening. One end of the heat dissipation
element is positioned between the bezel and the light source. The
other end of the heat dissipation element has a protrusion portion,
which is inserted into the opening and projected outside the bezel.
The lateral surface of the protrusion portion is abutted against
the inner wall of the opening. The first polarizer and the second
polarizer are disposed above the backlight module. The liquid
crystal display panel is disposed between the first polarizer and
the second polarizer.
[0012] Other objects, features, and advantages of the invention
will become apparent from the following detailed description of the
preferred but non-limiting embodiments. The following description
is made with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013] FIG. 1A schematically illustrates a backlight module
according to a first embodiment of the invention;
[0014] FIG. 1B illustrates an exploded diagram of a bezel and a
heat dissipation element of FIG. 1A;
[0015] FIG. 2A schematically illustrates a backlight module
according to a second embodiment of the invention;
[0016] FIG. 2B illustrates an exploded diagram of a bezel and a
heat dissipation element of FIG. 2A;
[0017] FIG. 3A schematically illustrates a backlight module
according to a third embodiment of the invention;
[0018] FIG. 3B illustrates an exploded diagram of a bezel and a
heat dissipation element of FIG. 3A;
[0019] FIG. 4A schematically illustrates a backlight module
according to a fourth embodiment of the invention;
[0020] FIG. 4B illustrates an exploded diagram of a bezel and a
heat dissipation element of FIG. 4A;
[0021] FIG. 5 schematically illustrates a backlight module
according to a fifth embodiment of the invention; and
[0022] FIG. 6 illustrates a liquid crystal display device according
to a sixth embodiment of the invention.
DETAILED DESCRIPTION OF THE INVENTION
First Embodiment
[0023] Please refer to FIG. 1A and FIG. 1B at the same time. FIG.
1A schematically illustrates a backlight module according to a
first embodiment of the invention. FIG. 1B illustrates an exploded
diagram of a bezel and a heat dissipation element of FIG. 1A. As
shown in FIG. 1A and FIG. 1B, the backlight module 10 includes a
bezel 11, at least a light source 12, and a heat dissipation
element 13. The bezel 11 has at least one opening 1a. The light
source 12 is disposed above the bezel 11. The heat generation
portion of the light source 12 corresponds to the opening 11a. One
end of the heat dissipation element 13 is positioned between the
bezel 11 and the light source 12. The other end of the heat
dissipation element 13 has a protrusion portion 13b. The protrusion
portion 13b is inserted into the opening 11a and projected outside
the bezel 11. The lateral surface of the protrusion portion 13b is
abutted against the inner wall of the opening 11a for enabling the
heat dissipation element 13 to be fixed on the bezel 11. The size
of the opening 11a must allow the protrusion portion 13b to pass
through so that the lateral surface of the protrusion portion 13b
is tightly abutted against the inner wall of opening 11a.
[0024] In the present embodiment of the invention, the heat
dissipation element 13 is abutted against the inner wall of opening
11a and connected to the bezel 11 through the protrusion portion
13b. However, the ways of connection between the heat dissipation
element 13 and the bezel 11 is not limited thereto. For example, by
ways of screw joint, buckle joint, dowel joint, adhesive joint cup
joint, bolt joint or rivet joint, the heat dissipation element 13
can be connected to and pass through the bezel 11 with part of the
heat dissipation element 13 being projected outside the bezel 11.
Moreover, the heat dissipation element 11 includes high
thermo-conductive metal or metallic alloy, the bezel 11 includes
metal or metallic alloy, and the heat dissipation element 13 can be
thermo-conductively connected to the bezel 11. Examples of the
light source 12 include an external electrode fluorescent lamp
(EEFL), a cold cathode fluorescent lamp (CCFL), a hot cathode
fluorescent lamp (HCFL) or a cold cathode flat fluorescent lamp
(CCFFL). In the present embodiment of the invention, the light
source 12 is exemplified by a CCFL. The heat generation portion of
the light source 12 is an electrode of CCFL for example.
[0025] In the relative position between the heat dissipation
element 13 and the bezel 11 and the light source 12, the protrusion
portion 13b is projected outside the bezel 11 by the way of passing
through the opening 11a. The heat dissipation element 13 passes
through the bezel 11 and corresponds to the light source 12. During
the heat dissipating process of the heat dissipation element 13,
firstly, the end of the heat dissipation element 13 closer to the
light source 12 directly absorbs the heat generated by the light
source 12. Next, the heat dissipation element 13 transmits the
absorbed heat to the protrusion portion 13b along the direction of
the arrow 50. Then, the heat dissipation element 13 dissipates the
heat outwardly at the protrusion portion 13b along the direction of
the arrow 50. Thus, the internal temperature of the backlight
module 10 is decreased, the luminance efficiency of the light
source 12 is increased, and the luminance of the backlight module
10 is enhanced.
[0026] The backlight module 10 further includes a reflector 14. The
reflector 14 is disposed between the bezel 11 and the light source
12 and covers the heat dissipation element 13. Furthermore, the
protrusion portion 13b includes at least a fin 13c (5 fins 13c for
example) for increasing the contact area between the heat
dissipation element 13 and the external (the air for example) and
increasing the dissipation efficiency of the heat dissipation
element 13. The number of the fin 13c of the present embodiment of
the invention can be increased or decreased according to actual
needs.
[0027] In the present embodiment of the invention, a heat
dissipation element 11 such as a radiating fin with one or multiple
fins and of blade or other shapes is coupled to the bezel 11. The
heat transmission and dissipation effects of the heat dissipation
element 11 are used to absorb the heat generated inside the
backlight module 10. Meanwhile, by means of the heat dissipation
effect of the radiating fin, the internal heat of the backlight
module 10 is dissipated to the outside for maintaining the internal
temperature of the backlight module 10 to a range within which the
light source 12 has best efficiency in illuminating.
[0028] Moreover, the bezel 11 further has a bottom plate 11b and a
side plate 11c connected to the bottom plate 11b. An accommodation
space 11d is defined by the bottom plate 11b and the side plate
11c. The light source 12 is disposed in the accommodation space
11d. The bottom plate 11b has an opening 11a. The protrusion
portion 13b is inserted into the opening 11a and projected outside
the bottom plate 11b. The bottom surface of the end of the heat
dissipation element 13 closer to the light source 12 contacts the
top surface of the bottom plate 11b. On the bottom plate 11b, the
reflector 14 is not aligned with the top surface of the bottom
plate 11b. However, the reflectivity of the reflector 14 is not
affected. The reflector 14 is disposed in the accommodation space
11d and positioned among the bottom plate 11b, the side plate 11c
and the light source 12. Part of the reflector 14 covers the heat
dissipation element 13.
[0029] Any one who is skilled in the technology of the present
embodiment of the invention will understand that the technology the
present embodiment of the invention is not limited thereto. For
example, the reflector 14 is spread over or adhered onto the bottom
plate 11b and the side plate 11c of the bezel 11. Besides, the
backlight module 10 further includes a diffuser 16 and an optical
film module 17. The diffuser 16 is disposed above the light source
12 and covers the opening at the top end of the accommodation space
11d. Furthermore, the optical film module 17 is disposed above the
diffuser 16. The optical film module 17 includes a prism, a
diffuser or a brightness enhancement film. After the first frame 70
is coupled with the bezel 11, the optical film module 17 and the
diffuser 16 can be disposed above the bezel 11 and the light source
12.
[0030] Despite in the present embodiment of the invention, the heat
dissipation element 11 corresponds to the light source 12, however,
the technology of the present embodiment of the invention is not
limited thereto. For example, with regards to the distribution of
the internal temperature of the backlight module 10, a heat
dissipation element can be disposed in the region of the backlight
module 10 where the internal temperature is high and the heat is
intensified. The heat dissipation element still passes through the
bezel 11, and part of the heat dissipation element is projected
outside the bezel 11, so that the heat of the high-temperature
region of the backlight module 10 is dissipated more
efficiently.
[0031] According to the present embodiment of the invention, the
heat dissipation element 13 passes through the bezel 11 and is
projected outside the bezel 11, hence effectively dissipating the
internal heat of the backlight module 10 to the outside and
achieving the object of reducing the internal temperature of the
backlight module 10. Thus, the luminance efficiency of the light
source 12 is increased and the luminance of the backlight module 10
is enhanced.
Second Embodiment
[0032] Please refer to FIG. 2A and FIG. 2B at the same time. FIG.
2A schematically illustrates a backlight module according to a
second embodiment of the invention. FIG. 2B illustrates an exploded
diagram of a bezel and a heat dissipation element of FIG. 2A. The
backlight module 10a of the present embodiment of the invention
differs with the backlight module 10 of the first embodiment in the
bezel 11e. The bezel 11e of the present embodiment of the invention
differs with the bezel 11 of the first embodiment in the bottom
plate 11f. The bottom plate 11f of the present embodiment of the
invention differs with the bottom plate 11b of the first embodiment
in a number of openings 11g positioned opposite to the fins 13c. As
for other similar elements, the same reference labels are used and
their connections are not repeated here.
[0033] As shown in FIG. 2A and FIG. 2B, each fin 13c is inserted
into its corresponding opening 11g and projected outside the bottom
plate 11f of the bezel 11e. The lateral surface of each fin 13c is
abutted against the inner wall of corresponding opening 11g for
fixing the heat dissipation element 13 on the bezel 11e. The size
of the opening 11g must allow the fin 13c of the heat dissipation
element 13 to pass through so that the lateral surface of the fin
13c is tightly abutted against the inner wall of the opening
11g.
Third Embodiment
[0034] Referring to FIG. 3A and FIG. 3B at the same time. FIG. 3A
schematically illustrates a backlight module according to a third
embodiment of the invention. FIG. 3B illustrates an exploded
diagram of a bezel and a heat dissipation element of FIG. 3A. The
backlight module 20 of the present embodiment of the invention
differs with the backlight module 10 of the first embodiment in the
bezel 21 and the reflector 24. As for other similar elements, the
same reference labels are used and their connections are not
repeated here.
[0035] As shown in FIG. 3A and FIG. 3B, the bezel 21 has a bottom
plate 21b and a side plate 21c connected to the bottom plate 21b.
An accommodation space 21d is defined by the bottom plate 21b and
the side plate 21c. The light source 12 is disposed in the
accommodation space 21d. The bottom plate 21b has a recess 21a. The
bottom of the recess 21a has an opening 11a. One end of the heat
dissipation element 13 is positioned in recess 21a. The protrusion
portion 13b of the other end of the heat dissipation element 13 is
inserted into the opening 11a and projected outside the bottom of
the recess 21a. The lateral surface of the protrusion portion 13b
is abutted against the inner wall of the opening 11a for fixing the
heat dissipation element 13 on the bezel 21. The reflector 24 is
disposed in the accommodation space 21d and positioned among the
bottom plate 21b, the side plate 21c and the light source 12. Part
of the reflector 24 covers the heat dissipation element 13 and the
recess 21a. The bottom surface of the end of the heat dissipation
element 13 positioned in the recess 21a contacts the top surface of
the bottom of the recess 21a. On the bottom plate 21b, the
reflector 24 is aligned with the top surface of the bottom plate
21b and the top surface of the end of the heat dissipation element
13 positioned in the recess 21a.
Fourth Embodiment
[0036] Please refer to FIG. 4A and FIG. 4B. FIG. 4A schematically
illustrates a backlight module according to a fourth embodiment of
the invention. FIG. 4B illustrates an exploded diagram of a bezel
and a heat dissipation element of FIG. 4A. The backlight module 20a
of the present embodiment of the invention differs with the
backlight module 20 of the third embodiment in the bezel 21e. The
bezel 21e of the present embodiment of the invention differs with
the bezel 21 of the third embodiment in the bottom plate 21f. The
bottom plate 21f of the present embodiment of the invention differs
with the bottom plate 21b of the third embodiment in a number of
openings 1g positioned opposite to the fin 13c. As for other
similar elements, the same reference labels are used and their
connections are not repeated here.
[0037] As shown in FIG. 4A and FIG. 4B, each fin 13c is inserted
into its corresponding opening 11g and projected outside the bottom
of the recess 21a. The lateral surface of each fin 13c is abutted
against the inner wall of corresponding opening 11g for fixing the
heat dissipation element 13 on the bezel 21e. The size of the
opening 11g must allow the fin 13c of the heat dissipation element
13 to pass through so that the lateral surface of the fin 13c is
tightly abutted against the inner wall of the opening 11g.
Fifth Embodiment
[0038] Please refer to FIG. 5. FIG. 5 schematically illustrates a
backlight module according to a fifth embodiment of the invention.
The backlight module 60 of the present embodiment of the invention
differs with the backlight module 10 of the first embodiment in the
bezel 61 and heat dissipation element 63. As for other similar
elements, the same reference labels are used and their connections
are not repeated here.
[0039] As shown in FIG. 5, the bezel 61 includes a bottom plate 61b
and a side plate 61c connected to the bottom plate 61b. An
accommodation space 61d is defined by the bottom plate 61b and the
side plate 61c. The light source 12 is disposed in the
accommodation space 61d. The side plate 61c has an opening 61a. One
end of the heat dissipation element 63 is positioned between the
bezel 61 and the light source 12. The other end of the heat
dissipation element 63 has a protrusion portion 63b. The protrusion
portion 63b is inserted into the opening 61a and projected outside
the side plate 61c. The bottom surface of the end of the heat
dissipation element 63 closer to the light source 12 contacts the
top surface of the side plate 61c. On the side plate 61c, the
reflector 14 is not aligned with the top surface of the side plate
61c. However, the reflectivity of the reflector 14 is not affected.
The reflector 14 is disposed in the accommodation space 61d and
positioned among the bottom plate 61b, the side plate 61c and the
light source 12. Part of the reflector 14 covers the heat
dissipation element 63.
[0040] Furthermore, the protrusion portion 63b includes at least a
fin 63c (5 fins 63c for example) for increasing the contact area
between the heat dissipation element 63 and the external (the air
for example) and increasing the dissipation efficiency of the heat
dissipation element 63. The number of the fin 63c of the present
embodiment of the invention can be increased or decreased according
to actual needs.
Sixth Embodiment
[0041] Referring to FIG. 6, a liquid crystal display device
according to a sixth embodiment of the invention is shown. As shown
in FIG. 6, the liquid crystal display device 30 includes the
backlight module 10, 10a, 20, 20a or 60 of above embodiments, a
first polarizer 31, a second polarizer 32, and a liquid crystal
display panel 33. The present embodiment of the invention is
exemplified by the backlight module 10. The first polarizer 31 and
the second polarizer 32 are disposed above the backlight module 10.
The liquid crystal display panel 33 is disposed between the first
polarizer 31 and the second polarizer 32. After the first frame 70
is coupled with the second frame 80, the liquid crystal display
panel 33, the first polarizer 31 and the second polarizer 32 can be
disposed above the backlight module 10. Besides, the
light-transmission line of the first polarizer 31 is substantially
perpendicular to the light-transmission line of the second
polarizer 32. Furthermore, the liquid crystal display device 30 can
be applied in electronic products such as computer monitor, flat
TV, monitor, pocket PC TV, mobile phone, handheld game device,
digital camera (DC), digital video (DV), digital audio device,
personal digital assistant (PDA), webpad, notebook, palm-top
computer, lap-top computer, Table PC.
[0042] According to the backlight module the liquid crystal display
device disclosed in the above embodiments of the invention, the
heat dissipation element passes through the bezel and is projected
outside the bezel, so that the heat generated by the light source
of the backlight module is dissipated to the outside and that the
internal temperature of the backlight module is reduced. Thus, the
luminance efficiency of the light source is increased, the
luminance of the backlight module is enhanced, and the operation
quality of the liquid crystal display device is maintained.
[0043] While the invention has been described by way of example and
in terms of a preferred embodiment, it is to be understood that the
invention is not limited thereto. On the contrary, it is intended
to cover various modifications and similar arrangements and
procedures, and the scope of the appended claims therefore should
be accorded the broadest interpretation so as to encompass all such
modifications and similar arrangements and procedures.
* * * * *